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If the wiggle and pull doesn't work... thread the nut back on until it is flush with the top of the helm shaft thread. Grab a buddy and a brass rod and hammer. While you are pulling out firmly on the wheel, your buddy can center the brass rod on the helm nut and strike rod with the hammer. It should come loose with a couple blows. You could also apply a little heat carefully to the wheel hub around the helm shaft if it is really corroded.